• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A layer of electro-optical material 42, a data electrode 18 connected to the electro-optical layer 42 to receive a data voltage activating a portion of the electro-optic layer 42, and an electrical inter- Plasma-address display device comprising a plurality of plasma channels (20) generally extending across said emitter electrode (18) for selective switching on an optical layer. Each of the plasma channels 20 includes a separate, elongated cathode 30 and anode 31 electrode and an ionizable gas 44. The cathode 30 and anode 31 electrodes are arranged in a group to reduce the number of drivers 28 required to drive the cathode 30 and anode 31 electrodes. In order to further reduce the total number of drivers of the PALC display device with more pixels per column than columns, the plasma channels 20 are interchanged with the data electrodes 18. The plasma channel 20 now extends in the row direction and the data electrode 18 extends in the column direction. The video signal V to be displayed must be converted into a data signal to be provided to the data electrode 18 in the row direction instead of in the column direction.
    公开号:KR19990014878A
    申请号:KR1019970708223
    申请日:1997-02-13
    公开日:1999-02-25
    发明作者:람멜즈마테우스요한누스게라르두스
    申请人:요트.게.아.롤페즈；코닌클리케필립스일렉트로닉스엔.브이.；
    IPC主号:
    专利说明:

    Plasma-address display
    EP-B-0,325,387 discloses a plasma-addressed liquid crystal display, commonly referred to as a PALC display device. Known PALC display devices include a first substrate having parallel transparent row electrodes deposited thereon, a second substrate having parallel sealed plasma channels corresponding to the columns of the display, and an electrical material such as a liquid crystal material sandwiched therebetween. Contains optical materials Each plasma channel of the second substrate is filled with a low pressure ionizable gas (eg, helium) and includes a cathode electrode and an anode electrode separated along the channel to ionize the gas to produce a conductive plasma. do. The channel is shielded by a thin transparent insulating sheet. Each of the plasma channels intersects all the row electrodes to form a matrix formed of overlapping regions. The overlap region corresponds to a pixel of electro-optic material.
    The operation of the PALC display device will be described more clearly in the form of an embodiment, taking into account when the electro-optical material is a liquid crystal material (LC-material). The plasma channel acts as a column switch capable of selectively addressing columns of liquid crystal pixel elements (LC-pixels). Successive lines of data signals representing the image to be displayed are sampled at the row position and the sampled data voltages are each applied to the row electrodes. All but one of the row plasma channels are in a deionized or nonconductive state. The plasma of one channel selected to be ionized is in a conducting state and, in practice, sets a reference potential on an adjacent side of the row of LC-pixels so that each LC-pixel is charged at a difference between the reference potential and the row potential. do. The ionized channel is then turned off to isolate the LC-pixel charge and store data for one frame period. When the next column of data appears at the row electrode, only the next plasma channel column is ionized to store the data voltage in the next column of LC-pixels, and this process is repeated. As is well known, the weakening of each LC-pixel for backlight or incident light is a function of the voltage stored across the pixel.
    In addition, two possibilities for selecting the plasma channels one by one are known. The first possibility indicates that one electrode of each plasma channel is connected to a reference potential. Thus, all these electrodes can be interconnected to receive a reference potential. The remaining electrode of each plasma channel is connected to receive a pulse signal. The plasma channels are selected one by one to provide a voltage pulse with a value for the reference voltage that is large enough to ionize the plasma to one pulse signal, while all other pulse signals have values for the reference voltage that are too low to ionize the plasma. Supply the voltage. Considering a PALC display device having N columns of pixels, an N pulse driver is required to supply an N pulse signal to the panel. This panel has a 2N connection for providing a pulse signal and a reference voltage to the electrodes of the plasma channel. The second possibility is that the number of pulse drivers is reduced by considering both the anode and cathode electrodes together in a group. The group is selected such that each of the anode groups includes only one electrode of each of the cathode groups, and in the same way each of the cathode groups contains only one electrode of each of the anode groups. Adjacent cathode-anode electrode pairs are each positioned within one channel, so that a channel having an electrode that forms any one of the first group includes any one and only one electrode of the second group. Considering again a PALC display device having N columns of pixels, both the cathode and anode electrodes are considered one in a group of N 1/2 lines, with one pulse driver per group. When this is displayed at the place of N 2N 1/2 pulse appears to the driver, and connected in each group are made on the PALC display panel instead of 2N 2N 1/2.
    Known display devices have the drawback that many data drivers are still required to provide data signals to the row electrodes.
    It is an object of the present invention to provide a display device in which the total number of drivers is reduced.
    One aspect of the invention is characterized in that the data electrodes are arranged to constitute M columns, the plasma channel is arranged to constitute N rows, and the data driver circuit is adapted to provide data signals to the rows of selected pixel elements. . The invention is substantially based on the fact that PALC displays contain more pixels than the number of columns per column. The total number of connections can be reduced by transposing the display such that the plasma channels make up a row and the former row electrodes now make up a column. The previous row electrodes will be referred to as data electrodes in order to avoid confusion about row electrodes extending in the column direction later. The conductive plasma channel now selects one row instead of one column of pixel elements. This requires that the video signal be provided in rows of selected pixels instead of columns of selected pixels. If the video signal contains a frame of lines (this is common), a video transposing circuit is required to cross the video information. When a video signal is generated by a computer video card that uses the memory to store video information, the circuitry that controls the memory must be adapted to cross the video information.
    The following example illustrates that the measures of the present invention reduce the total number of drivers required to provide drive signals to the PALC display panel. Assume a known PALC display with a 3: 4 ratio has 1200 columns (plasma channels) and 1600 rows (data electrodes). The total number of drivers is at least 1670 (ie 2 × 1200 1/2 for driving anode and cathode groups and 1600 for driving data electrodes). The corresponding PALC display according to the invention has 1200 data columns and 1600 plasma channels. The total number of drivers is 1280 (ie 2 × 1600 1/2 for driving anode and cathode groups and 1200 for driving data electrodes). The present invention may substantially further reduce the total number of drivers for a new display having a ratio of 16: 9 in which the number of pixels in one column is greater than the number of columns.
    Reducing the number of data electrodes has the advantage that the spacing between connections to the data electrodes becomes larger.
    It is important to provide a sufficiently large voltage difference between the anode and cathode electrodes for plasma ignition, where the positions of the anode and cathode electrodes can be interchanged. These electrodes are therefore referred to as first and second electrodes.
    Video cross circuits and crossed liquid crystal displays are known from US-5,267,045. This known technique discloses a video circuit adapted to enable the display of video information of several television standards having a different number of lines per frame on a liquid crystal display (or LCD) with a fixed number of columns. The video circuitry includes a memory, reads video information in the column direction, and then reads the video information in the row direction at an adaptive clock rate. In one embodiment the read video information is provided in rows of crossed LCDs. There is no suggestion that such crossed LCDs have any advantage if standards with different number of lines do not matter.
    Advantageous embodiments are detailed in the dependent claims.
    In the embodiment featured in claim 3 the total number of connections is further reduced.
    Buzak et al., A 16 Inch Full Color Plasma-addressed Active-Matrix LCD, Digest of Technical Papers, 1993 SID International Symposium, Soc. for Info. Display pp.883-886 discloses a color PALC display device. Each intersection of one plasma channel extending in the column direction and three data electrodes extending in the row direction (color filters are aligned with the three data electrodes, each of which is for red, green, and blue) is a full color Defines a pixel (full color filter). Thus, in connection with the above embodiment, such a PALC display device has 1200 columns (plasma channels) and 3 x 1600 rows (data electrodes). The total number of connections is no less than 4870 (ie 2 × 1200 1/2 ) for the anode and cathode groups and no less than 4800 for the data electrodes.
    The embodiment according to claim 3 forms a group of pixels by using three plasma channels in a row direction intersected by one data electrode in a column direction. The color filter is now aligned with the plasma channel. The plasma driver circuit connected to the anode and cathode electrodes must be adapted to sequentially search for three plasma channels within a group. The data driver circuit connected to the data electrode must be adapted to sequentially supply data signals belonging to three colors to the common data electrode such that data of a particular color is provided to an active plasma channel associated with the color filter corresponding to that color. In this way the number of data electrodes and the number of connections to the data electrodes are reduced by a factor of three. The number of plasma channels increases by a factor of 3, but when the anode and cathode are grouped together, the number of pulse drivers connected to the grouped anode and cathode electrodes increases with the square root. Thus, the total number of drivers is reduced. Referring to the above embodiment, the PALC display according to the present invention includes 1200 data electrodes extending in the column direction and 3 x 1600 plasma channel extending in the row direction. The total number of drivers is about 1339 (ie 2 × (3 × 1600) 1/2 for the anode cathode group and 1200 for the data electrode), which is significantly less than the 4870 required for known PALC displays. If the interconnection between the cathode and anode electrodes is made on a PALC panel, respectively, the number of connections is reduced by that amount.
    Although the above-described method of grouping anode and cathode electrodes is quite efficient, there are many other possibilities for grouping anode and cathode electrodes such that the formulated requirements are met. At this time, the number of pulse drivers is still reduced, but the degree is weak. It may be beneficial to group less than the maximum allowable N 1/2 electrode to further lower the capacitive load of the pulse driver connected to this group of electrodes.
    These and other aspects of the invention will be described in more detail below in conjunction with the accompanying drawings.
    The present invention relates to a plasma-addressed display for displaying a matrix of M columns (N is greater than M) consisting of N pixels, wherein the display device comprises an electrical device sandwiched between a long data electrode and a plasma channel. A plasma drive circuit connected to the optical material layer, the first and second electrodes for selectively activating the plasma channel to select the pixel element associated with the active plasma channel, and data to the pixel element in response to the video information. A data driving circuit connected to a data electrode for providing a signal, wherein the data electrode and the plasma channel are crossed with each other to obtain overlapping regions constituting pixel elements corresponding to the pixels, The plasma channel comprises separate first and second electrodes, wherein the first The first electrodes are interconnected in a plurality of first groups and the second electrodes are interconnected in a plurality of second groups such that each of the groups contains only one electrode of each of the second group.
    1 is a schematic block diagram of a conventional flat panel display system.
    2 is a perspective view of a portion of a conventional PALC display device.
    3 is a known circuit diagram for placing the cathode and anode electrode connections of a channel into multiple groups.
    4 is a perspective view of a portion of a PALC display device in accordance with the present invention.
    5 is a schematic block diagram of a flat panel display system according to the present invention;
    6 is a perspective view of a portion of a conventional color PALC display device.
    7 is a perspective view of a portion of a color PALC display device in accordance with the present invention.
    1 and 2 are commonly used to describe the electronic circuits and configurations that drive conventional PALC displays. FIG. 1 shows a flat panel display system 10, which shows a typical PALC display device. A flat panel display system includes a display comprising a pattern formed of rectangular flat arrays or display elements 16 (or referred to as pixels) of nominally identical data storage spaced apart from each other by a predetermined distance in the vertical and horizontal directions. And a display panel 12 having a surface 14. Each display element 16 of the array represents an overlapping portion of the thin narrow electrode 18 aligned in the vertical direction and the long narrow width plasma channel 20 aligned in the horizontal direction. (The electrode 18 will be referred to as a row electrode below). Display element 16 associated with one of channels 20 represents one data line of video information (V).
    The width of the row electrode 18 and the channel 20 determines the size of the display element 16, which is typically rectangular in shape. The row electrode 18 is in a first electrically nonconductive state and is deposited on the major surface of the optically transparent substrate 34 (see FIG. 2), and the plasma channel columns are typically applied to the second transparent substrate 36. Is formed. An electro-optical material 42, such as a liquid crystal (LC) material, is positioned between the substrates 34 and 36. Those skilled in the art will find that certain systems, such as direct view or projection type reflective displays, will require only one substrate to be optically transparent.
    Row electrode 18 receives a data drive signal developed on parallel output conductor 22 'by an output amplifier 23 (FIG. 2) of data driver circuit 24 that receives video information (V). Channel 20 receives data strobe signals of the voltage pulse type that are developed on parallel output conductors 26 'by the output amplifier 21 (FIG. 2) of the plasma driver circuit 28. As shown in FIG. The cathode electrode 30 (FIG. 2) and the anode electrode 31 are provided in each of the channels 20.
    In order to synthesize the image in the entire area of the display surface 14, the display system 10 is adapted to the data driver circuit 24 and the plasma driver circuit so that every row of the display element 16 of the display panel 12 is addressed by one column. The scan control circuit 32 harmonizing the function of (28) is used. Display panel 12 may use different types of electro-optical material 42. For example, when using a material that changes the polarization state of incident light, the display panel 12 is positioned between a pair of optical polarization filters, which filter together with the display panel the luminance of the light propagating through them. Change). However, the use of scattering liquid crystal materials, such as electro-optical materials, will not require the use of polarizing filters. A material or layer of material that weakens the transmitted or reflected light in response to the voltage across it will be referred to hereinafter as an electro-optic material. Liquid crystal (LC) materials are currently the most common examples, and the detailed description will refer to LC materials, but it should be noted that the present invention is not limited to display panels of liquid crystal materials.
    2 shows a PALC display panel using LC material. Only a few rows of electrodes 18 and plasma channel 20 are shown. The columns of the PALC display panel consist of a number of parallel and elongated sealed plasma channels 20 lying under the layer 42 of LC material. Each of the plasma channels 20 is filled with an ionizable gas 44, sealed with a thin insulating sheet 45, which is typically glass, on the inner channel surface the first and second separate and elongated electrodes 30, 31. ), Which extend by the length of the plasma channel 20. In the prior art arrangement the first electrode 30 is typically grounded and is usually referred to as a cathode. The second electrode 31 is referred to as an anode because a positive strobe pulse is sufficient to cause the electrons emitted from the cathode electrode 30 to ionize the gas to the anode 31 relative to the cathode electrode 30. Because it will be provided. As described above, each plasma channel 20 in turn ionizes its gas with a strobe pulse to produce a plasma. The ionized plasma has a low conductivity and connects the reference potential to the column of pixels of the LC layer 42. If the strobe pulse ends and deionization then occurs, the next channel is strobe and turned on. Since each of the row electrodes 18 traverses the entire row of pixels, only one plasma channel 20 is allowed to be activated (in the conducting state) at a time to avoid crosstalk.
    3 shows the cathodes 30-1, ..., 30- of the channel;) And the anode (31-1,…, 31-Is a circuit diagram showing a known arrangement incorporating a plurality of groups. The number of pulse drivers connected to the connections 8, 9 to the PALC display panel 12 is the cathode electrodes 30-1, ..., 30-.) And anode electrodes 31-1, ..., 31-) Is reduced to one by one, resulting in cathode groups 30-1, ..., 30-Each of the anode electrodes 31-1, ..., 31-.In the same way, the anode groups 31-1, ..., 31-Each of the cathode groups 30-1, ..., 30-.Each contains only one electrode. Adjacent cathode-anode electrode pairs are located in one plasma channel 20, so that a plasma channel 20 having electrodes forming any one of the first group is only one of any one of the second group. One electrode. The anode and cathode electrodes may be interconnected (as shown) on the PALC display panel to also reduce the number of connections of the PALC display panel. Considering such a PALC display device having N columns of pixels, the cathode electrodes 30-1, ..., 30-) And anode electrodes 31-1, ..., 31-) Is considered to be one in a group of N 1/2 having one connection 8, 9 per group. This is 2N 1/2 instead of N + 1 connection (N for pulse driver connected to anode electrode and 1 for reference voltage connected to cathode electrode interconnected on PALC display panel) for output conductor 26 '. It appears as a connection 8, 9.
    By this way of grouping the anode and cathode electrodes, the smallest possible number of pulse drivers and / or connections is obtained. There are many other possibilities for grouping anode and cathode electrodes such that the formulated requirements are met. At this time, the number of pulse drivers is still reduced, but the degree is weak.
    4 is a perspective view of a part of a PALC display device according to the present invention. The same reference numerals as in FIG. 2 denote the same elements as in FIG. The PALC display panel 12 is crossed so that the plasma channel 20 forms a row, and the previous row electrode 18 now forms a column. The electrode 18 will be referred to as the data electrode 18 to avoid confusion with the row electrodes extending in the column direction. The cathode electrode 30 and the anode electrode 31 are grouped together to minimize the number of pulse drivers 28 required to activate the plasma channel 20.
    5 is a schematic block diagram of a flat panel display system according to the present invention. The same elements as in Fig. 1 are designated by the same reference numerals. The plasma drive circuit 28 provides data strobe signals to the grouped output conductors 26 'connected to the cathode and anode electrodes 30, 31 of each plasma channel 20 via connections 8, 9, respectively. . For simplicity, the grouping of the cathode and anode electrodes 30, 31 is depicted by a block with reference numeral Gc, an embodiment of said grouping is shown in FIG. The data driver circuit 24 receives the video information V and provides a data drive signal to the data electrode 18 through the parallel output conductor and the output amplifier 23. Since the plasma channel 20 selects a column dash row of the pixel element 16, the video information V must be converted in the row direction instead of the column direction into a data signal provided to the data electrode 18. This requires video cross circuitry 240.
    6 is a perspective view of a portion of a conventional color PALC display device as shown in the above publication by Buzak et al. Three color filters, each transmitting three different primary colors, are associated with three adjacent row electrodes 18 to obtain a group G of three display elements or pixels 16. Thus, each group of pixels consists of three row electrodes 18 extending in the row direction and one plasma channel 20 extending in the column direction.
    In a projection display, a color can be obtained by using three separate monochrome panels 12, each of which controls one of the three primary colors. In this case, the width of the row electrode 18 may be larger than that shown in FIG. 6, mainly to obtain square pixels, as shown in FIG.
    7 is a perspective view of another PALC display device according to the present invention. The same elements as those of FIG. 4 are referred to by the same reference numerals. The crossed PALC color display device of FIG. 4 is constructed such that the group G of pixels 16 consists of three adjacent plasma channels 20 extending in the row direction and one associated data electrode 18 extending in the column direction. Is adapted. The number of data electrodes 18 and thus the number of connections to the data electrodes decreases with a factor of three. The number of plasma channels 20 increases by a factor of 3, but the number of connections 8, 9 to the plasma channel only increases by the square root. Thus, the total number of connections to the PALC display device is further reduced.
    Another embodiment will be discussed which assumes a PALC display device having 576 lines of 720 pixels each. In the known non-parallel PALC display according to FIG. 2, 2 × (576) 1/2 = 48 to drive the cathode 30 and anode 31 electrodes of the plasma channel 20 extending in the column direction. Output amplifiers 21 are required, and 720 output amplifiers 23 are required to drive the row electrodes 18, so that 768 connections or drivers are required in total. In the crossed PALC display device according to FIG. 4, 2 × 720 1/2 × 54 outputs are used to drive the cathode 30 and anode 31 electrodes of the plasma channel 20 extending in the row direction. Since an amplifier 23 is needed and 576 output amplifiers 23 are needed to drive the data electrodes 18 extending in the column direction, 630 connections or drivers are needed (instead of 768) in total. In the known PALC color display device according to Fig. 6, 2 x (576) 1/2 = 48 pieces for driving the cathode 30 and anode 31 electrodes of the plasma channel 20 extending in the column direction. Since an output amplifier 21 is required, and 3 x 720 = 2160 output amplifiers 23 are required to drive the data electrodes 18 extending in the row direction, 2208 connections or drivers are required as a whole. In the cross- PALC color display device according to FIG. 7, in order to drive the cathode 30 and anode 31 electrodes of the plasma channel 20 extending in the row direction, 2 x (3 x 720) 1/2 to 93 Since six output amplifiers 21 are needed and only 576 output amplifiers 23 are needed to drive the data electrodes 18 extending in the column direction, 669 connections or drivers are needed instead of 2208 as a whole. do.
    The present invention can be used for all kinds of PALC displays, which typically have a small channel pitch for use in computer monitors, workstations or TV applications.
    Although the present invention has been described in conjunction with the preferred embodiments, modifications of the invention will be apparent to those skilled in the art within the above-described principles, and thus the invention is not limited to the preferred embodiments but these modifications are also It should be understood to be inclusive.
    In other words, the main aspect of the present invention is to receive an electro-optical material layer 42 and a data voltage connected to the electro-optical layer 42 and for activating a portion of the electro-optical layer 42. A plasma-address electro-form comprising an adapted data electrode 18 and a plurality of plasma channels 20 extending generally across the data electrode 18 for selectively switching on a portion of the electro-optical layer. An optical display device. The plasma channel 20 includes separate and elongated cathode and anode electrodes 30, 31 and an ionizable gas 44. The cathode and anode electrodes 30, 31 are arranged in groups to reduce the number of drivers 28 required to drive the cathode and anode electrodes 30, 31. In order to further reduce the total number of drivers of the PALC display device with more pixels per column than columns, the plasma channels 20 are interchanged with the data electrodes 18. The plasma channel 20 now extends in the row direction and the data electrode 18 extends in the column direction. The video signal V to be displayed must be converted into a data signal provided to the data electrode 18 in the row direction instead of in the column direction.
    Any reference signs in the following claims should not be construed as limiting what is claimed.
    权利要求:
    Claims (3)
    [1" claim-type="Currently amended] A plasma-address display device for displaying a matrix of M columns (N is larger than M) composed of N pixels 16,
    A layer of electro-optic material 42 sandwiched between the elongate data electrode 18 and the plasma channel 20;
    A plasma driver circuit (28) connected to the electrodes of the first (31) and the second (30) for selectively activating the plasma channel to select the pixel element (16) associated with the activated plasma channel (20); And
    A data driver circuit 24 connected to the data electrode 18 for providing a data signal to the pixel element 16 in response to video information V,
    The data electrode 18 and the plasma channel 20 intersect with each other to obtain an overlapping area constituting a pixel element corresponding to the pixel 16, and each plasma channel 20 is separated from the first 31 and the first. Two (30) electrodes, wherein the first electrode (30) is interconnected within a plurality of first groups and the second electrode (31) is interconnected within a second group such that the first Wherein each of the groups of includes only one electrode of each of the second groups, wherein:
    The data electrodes 18 are arranged to form M columns, the plasma channel 20 is arranged to form N rows, and the data driver circuit 24 directs the data signals to the selected rows of pixel elements 16. Plasma-address display device, adapted to provide.
    [2" claim-type="Currently amended] 2. A plasma-address display device as claimed in claim 1, wherein said video information (V) comprises a certain number of video lines.
    [3" claim-type="Currently amended] 3. A group (G) according to claim 1 or 2, wherein the display device further comprises a color filter, each of the plurality of adjacent pixel elements 16 exhibiting different colors enabling the display of color images. Common data aligning with the plasma channel 20 to obtain a value, and each group of pixel elements G co-operates with a plurality of plasma channels 20 equal to the number of pixel elements 16 of the group G Consisting of an electrode 18, the plasma driver circuit 28 is adapted to selectively activate the plasma channel 20 in a group, the data driver circuit 24 being sequential to the common data electrode 18. Plasma-address display device, adapted to provide a data signal.
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    同族专利:
    公开号 | 公开日
    WO1997035294A1|1997-09-25|
    JPH11506229A|1999-06-02|
    EP0830666B1|2000-05-10|
    EP0830666A1|1998-03-25|
    DE69701941T2|2000-12-07|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1996-03-18|Priority to EP96200749
    1996-03-18|Priority to EP96200749.8
    1997-02-13|Application filed by 요트.게.아.롤페즈, 코닌클리케필립스일렉트로닉스엔.브이.
    1999-02-25|Publication of KR19990014878A
    优先权:
    申请号 | 申请日 | 专利标题
    EP96200749|1996-03-18|
    EP96200749.8|1996-03-18|
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